Our exclusive Link Cases fully encapsulate batteries and snap securely shut, eliminating the risk of incidental contact with other batteries or loose objects that can lead to short circuits. Multiple Link cases can be interconnected with one another, creating an efficient, organized storage system that&';s ideal for carrying in a patrol bag, backpack, equipment case or travel bag. Batteries sold separately. ASP Training Room - Battery Overview https://youtu.be/zNmQT6f8qNo ASP Training Room - Battery Link Case https://youtu.be/UGVY_t6YW7Q